Shaft-coupling.



No. 807,926 ,PATENTED DEC. 19, 1905.

D. H. HBNDERSHOT.

SHAFT COUPLING. APPLICATION FIL'ED JULY 31.1905.

' WITNESSES QQTTUHNEX NITED STATES PATENT OFFICE.

SHAFT-COUPLING.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed July 31, 1905. Serial No. 271,977-

To all whom it may concern:

Be it known that I, DANIEL H. HENDER- SHOT, of Baldwinsville, in thecounty of Onondaga, in the State of New York, have invented new anduseful Improvements in Shaft- Couplings, of which the following, takenin connection with the accompanying drawings, is a full, clear, andexact description.

This invention relates to improvements in shaft-couplings, and refersmore particularly to that class in which opposed casing-sections aredrawn together by suitable bolts axially of the shaft and upon taperingcollars or sleeves which grip the shaft.

I am aware that it is broadly old to Wedge a split tapering sleeve uponthe meeting ends of the shaft-sections by means of axiallymovablecollars drawn together by bolts passing through both collars orcasingsections, such devices being shown in Patents No. 687,864,December 3, 1901, Smyth, and

Shaw, No. 674,024, May 14, 1901, the sleeves in both cases being of thedouble-cone type. I am also aware of the existence of Patent No.753,439, March 1, 1904, to D. S. Sinclair, which shows two splittapering sleeves clamped upon the shaft-sections by screwthreadedcollars or casing-sections. It is well known that When these couplingsare once secured in position to lock the meeting ends of the shaft theyare run for a considerable period of time without displacement of any ofthe parts and that durin such period the casing-sections become set byrusting or otherwise upon the tapering'sleeves, which in turn alsobecome rigidlyset upon the shaftsections, making it very difficult toremove the parts of the coupling or to uncouple the shaft-sectionswithout liability of breaking some of the parts. It is also well knownthat when separate tapering sleeve-sections are employed to grip theshaft the circumferential strain upon the casing-sections is bornealmost wholly by the bolts which draw them together unless someprovisions is made for interlocking one casing-section with the otheraside from the bolts to prevent their inde pendent circumferentialmovement relatively to each other. Furthermore, in the use of singledouble-taper sleeves, as in the Smyth and Shaw patents previouslyreferred to, I have found that the grip is mostly at the extreme ends ofthe sleeves, and therefore remote from the meeting ends of the shaft,owing to the fact that the center of the sleeve is necessarily thickerthan the ends and less yielding, thereby preventing the rigid engagementor firm grip of the center of the sleeve upon the ends of theshaft-sections and bringing an undue strain upon the thinner ends wherethe sleeve is the weakest.

My object,therefore, is, first, to cause the separate taperingsleeve-sections to grip the shaft sections with a uniform pressurethroughout their entire lengths second, to lock each sleeve-section toits casing-section and to interlock one casing-section with the other toprevent independent relative movement circumferentially; third, toenable the casing-sections to be exactly centered one within the otherconcentric with the shaftsections before they are drawn together,thereby forming a centering-guide to keep the shaft-sections in exactalinement while the clamping-bolts are being tightened.

A further object is to mill the ends of the casing-section to bring themin planes exactly at right angles to the axis of revolution, so that themeeting faces may be calipered at intervals while the bolts are beingdrawn up, thereby further facilitating the exact centerin of theshaft-sections relative to each ot 1er.

Another object is to provide the telescoping flange of one case-sectionwith diametrically opposite cut-outs for the reception of a drift-toolto force saidsections apart when it is desired to uncouple theshaft-sections.

In the drawings, Figure 1 is an end view of my improved shaft-coupling,showing the shaft in section. Fig. 2 is a longitudinal section taken online 2 2, Fig. 1. Figs. 3 and 4 are perspective Views of the opposedcasingsections. Fig. 5 is a perspective view of one of the taperingsleeve-sections.

In carrying out the objects stated I employ a pair of separate butsimilar tapering sleeve-sections 1, which are placed upon the meetingends of the shaft-sections, as a, to be coupled and are inclosed andengaged by opposite but similar collars or casing-sections 2 and 2,having tapering bores 3 fitting snugly upon their respectivesleevesections, said casing-sections being drawn together upon thetapering sleeves 1 by clampingbolts 4.

The sleeve-sections 1 are exact duplicates, and each consists of atruncated conical metal bushing having a central lengthwisecylindricalbore or shaft-opening 5 and a tapering outer surface 6, terminating atits large end in annular flanges or dlametrically are also each providedwith an enlarged head 11 and a reduced tapering outer end 12.

The meeting face or end of each casingsection 2 and 2 is recessed,forming an annular flange 13 and 13, the inner diameter of the flange 13being substantially the same as the outer diameter of the flange 13, andthe latter flange is adapted to fit easily within the flange 13, so thatthe meeting ends of the casing-sections 2 and 2 telescope with each,

other for the purpose of centering the shaftsections one with the otherbefore the clamping-bolts are tightened and at the same time bringingthe sleeves 1 and casing-sections 2 a1pdf2 into concentricity with theaxis of the s a t.

The flange 13 is somewhat smaller than the remaining portion of its head11, leaving an annular abutment or truing face 14. This face 14 and theend face of the flange 13 are -milled in planes at exactly right angleswith the axis of their respective sections, the object of which is topermit the intervening space to be calipered at intervals around thecircumference ofthe flange 13, so that all parts of both casing-sectionsmaybe adjusted axially alike by the clamping-bolts to prevent binding orthrowing the shaft-sections out of alinement.

The meeting end of each casing-section 2 and 2 is provided with a seriesof, in this in stance three, radial lugs 0r locking-shoulders 15 and 16,the shoulders 15 and 16 of the section 2 projecting inwardly andradially from the inner face of the flange 13, while the shoulders 15and 16 of the casesection 2, are spaced apart from the flange 13, adistance substantially equal to the thick ness of the flange 13 topermit said flange to enter between the flange 13 and interlockingshoulders 15 and 16 of the section 2.

I'preferably provide each of the sections 2 and 2 with a pair ofshoulders or lugs 16, which are spaced apart circumferentially, leavingan intervening space 17 of substantially the same shape and size as theshoulder 15, which is diametrically opposite to said space 17, so thatwhen the sections 2 and 2 are brought together end to end in the act ofcoupling the shaft-sections the shoulder 15 of each section enters thespace 17 of the op posite section at the same time that the flange 13enters within the flange 13, thereby centering and locking thecasing-sections 2 and 2 against circumferential or radial movementrelatively to each other and relieving shearing strains upon theclamping-bolts 4.

The inner or meeting end of each bore 3 is provided with diametricallyopposite recesses or channels 18, which receive the projections 8 oftheir respective sleeve-sections 1 for the purpose of locking eachsleeve-section to its casing-section against independent circumferentialmovement.

It is now clear that when the coupling parts are operatively mountedupon the shaft-sections the sleeves 1 are locked to theircasing-sections, and the casing-sections are locked to each otheragainst independent rotary movement.

Each of the enlarged heads 11 of the casing-sections 2 and 2 is providedwith a series of, in this instance four, bolt-openings 19, which arespaced equidistant apart circumferentially around the sleeve-opening 3bethese coupling parts upon the shaft-sections the casing-sections 2 and2 are first placed over the ends of their respective shaft-sections andmoved back far enough to permit the sleeve-sections 1 to be similarlyplaced upon the ends of said shaft-sections with their enlarged endsfacing each other and substantially coincident with the meeting endfaces of the shaft-sections, so that the adjacent ends of thesleeve-sections practically abut against each other when theshaft-sections are brought into axial alinement end to end. After thesleevesections 1 have been thus placed upon their respectiveshaft-sections, which they closely fit, the outer casing-sections 2 and2 are then drawn toward each other along the tapering faces of theirrespective sleeve-sections until the flange 13 enters the flange 13 andthe shoulders 15 of one section enter the space 17 of the oppo, sitesection, whereupon the bolts 4 are inserted in their respective openingsin bothcasing-sections and engaged by the nuts 4, by which the opposedcasingsections arefirmly drawn toward each other to compress thesleeve-sections 1 upon their respective shaft-sections.

The object of splitting each of the sleevesections 1 through one sidefrom end to end is to enable all parts thereof to be compressed intofirm gripping engagement with the shaft as the casing-sections are drawntogether. It is therefore clear that the grippingsurface of the couplingis coextensive with the inner area or bore of both sleeve-sections,because these sleeve-sections are firmly locked to the case-sections 2and 2 against rotation indedendently of each other, and the case-sections are also locked against independent rotation through the medium ofthe interlocking shoulders 15 and 16, thus making, in effect, asubstantially unitary structure acting to compress the sleeves firmlyupon the shaft.

In order that the coupling-sections may be readily taken apart when thebolts 4 are withdrawn, I provide the flange 13 with diametricallyopposite radial openings 20, extending through the end face of theflange for the reception of the drifttool, (not shown,) but which may beinserted through said opening so as to engage the end face of the flange13 and abutting face 14 of the case-section 2', thereby separating saidcase-sections and releasing the same from engagement with theirrespective sleeves, said sleeves extending through the outer end facesof the casingsections and may be also engaged by a suitable driving-toolto release the sleeves from the casing-section in case they should slideback when separating said casing-sections.

In drawing the casing-sections together it is desirable to have themslide as freely as possible upon their respective sleeves, and for thispurpose I provide the tapering faces of the case-sections 2 and 2 withone or more annular grooves, in which are seated suitable packing-rings21, of graphite or similar lubricant.

What I claim- 1. In a shaft-coupling, two opposed tapering sleeves, oneforeach shaft-section, in combination with two opposed casing-sectionshaving conical inner bearings fitting upon their respective taperingsleeves, said sleeves and casing-sections having shoulders interlockingwith each other, and the casing-sections having additional shoulders ontheir adjacent end faces interlocking with each other, andclamping-bolts for drawing said casing-sections toward each other.

2. In a shaft-coupling, two tapering sleeves split longitudinallythrough one side from end to end, and each having a radial boss near itsmeeting end, in combination with opposed casing-sections, each fittedupon one of the sleeves and movable endwise thereon, the meeting end ofeach casing-section having a recess receiving said boss, and means todraw the casing-sections toward each other.

3. In a shaft-coupling, two split tapering sleeves, in combination withopposed casingsections, each fitted upon and movable length wise of oneof the sleeves, said casing-sections having interlocking shouldersengaging each other as the casing-sections are drawn together, andclamping-bolts for drawing said sections toward each other.

4-. In a shaft-coupling, the combination of two tapering sleeve-sectionssplit through one side, separate casingsections each fitted upon andmovable endwise of one of the sleeves, said casing-sections having theirmeeting ends provided with annular flanges, one fitting within theother, clamping-bolts for drawing said casing-sections together, saidcasing-sections having radial lugs on their meeting ends for locking thecasing-sections together against independent rotary movement.

5. In a shaft-coupling, the combination of two separate taperingsleeves, each split longitudinally through one side and having a radialboss, separate casing-sections each fitted upon and movable endwise ofone of the sleeves, and provided with a recess receiving said boss saidcasing-sections having interlocking shoulders on their meeting ends andalso formed with annular flanges on said meeting ends, one flangefitting within the other and provided with openings therethrough, forthe purpose described.

In witness whereof I have hereunto set my hand this 22d day of July,1905.

DANIEL H. HENDERSHOT.

Witnesses:

H. E. CHASE, M. M. N OTT.

